eATRP 合成的双亲水性嵌段共聚物封端金纳米粒子的稳定性增强,Journal of Applied Polymer Science

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eATRP 合成的双亲水性嵌段共聚物封端金纳米粒子的稳定性增强
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2024-01-03 , DOI: 10.1002/app.55146
Qin Liu ₁ , Lan Xu ₁

Affiliation

在这项研究中，金纳米粒子（Au NPs）被一种新型的、明确的双亲水性嵌段共聚物，聚（乙二醇）-嵌段-聚（单-2-（甲基丙烯酰氧基）乙基琥珀酸酯）（PEG-b- PEMA）。_{使用PEG-Br大分子引发剂（M n} ≈2000 g mol ^-1）通过水相电化学介导的原子转移自由基聚合成功制备了具有长侧链和相对窄分散指数的PEG-b-PSEMA 。通过在添加还原剂之前简单地将 PEG-b-PSEMA 和 Au 前驱体混合，Au 前驱体和 PSEMA 的羧酸基团之间会发生库仑相互作用，从而形成致密的 Au 纳米颗粒。这使得 Au NP 即使在温度变化、pH 调整和在有机溶剂中孵育的情况下也能保持分散。与柠檬酸钠（Au@citrate）和MeO-PEG-OH（Au@PEG）相比，PEG-b-PSEMA赋予Au NPs在4-硝基苯酚转化为4-氨基苯酚的有机溶剂中具有更显着的催化活性。此外，还测试了PEG-b-PSEMA稳定的Au NPs（Au@PEG-b-PSEMA）在仅pH 10的碱性溶液中对罗丹明-B的染料降解性能，可以实现超过99%的染料降解9 分钟后 PEG-b-PSEMA 诱导与 Au NP 的库仑相互作用，为有机或特定酸碱环境中的催化应用提供出色的稳定性。

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Enhanced stability of gold nanoparticles capped with double hydrophilic block copolymers synthesized by eATRP

In this study, the gold nanoparticles (Au NPs) are capped with a novel, well-defined double hydrophilic block copolymer, poly (ethylene glycols)-block-poly(mono-2-(methacryloyloxy) ethyl succinate) (PEG-b-PSEMA). The PEG-b-PSEMA, with long side chains and relatively narrow dispersity index, is successfully prepared by aqueous electrochemically mediated atom transfer radical polymerization using a PEG-Br macroinitiator (M_n≈2000 g mol⁻¹). By simply mixing PEG-b-PSEMA and Au precursor before adding reductants, coulombic interactions occur between the Au precursor and the carboxylate group of the PSEMA, as a result dense Au NPs are formed. This enables the Au NPs to remain dispersed even in the presence of temperature variations, pH adjustments, and incubation in organic solvents. Au NPs were endowed by PEG-b-PSEMA with more remarkable catalytic activity in organic solvents of 4-nitrophenol into 4-aminophenol than by sodium citrate (Au@citrate) and MeO-PEG-OH (Au@PEG). In addition, PEG-b-PSEMA-stabilized Au NPs (Au@PEG-b-PSEMA) were also tested for the dye degradation property against Rhodamine-B in only pH 10 basic solution, and over 99% of dye degradation can be achieved in 9 min. PEG-b-PSEMA induces coulombic interactions with Au NPs, providing outstanding stability for catalytic applications in organic or specific acidic-base environments.

更新日期：2024-01-03

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